skids, leg, undercarriage, lower part, base
脚 centers on the lower supporting part of something: a leg, a base, or an undercarriage. The skids sense is a specific application of that same supporting lower structure.
脚 combines ⺼ (flesh/body part) with 却, which likely contributes the sound and the idea of retreating or bending, together suggesting the leg as a body part that bends.
The flesh radical ⺼ on the left marks a body part, and 却 on the right looks like a bent knee and foot. Together they form the leg, the body's lower support.
For キャク, imagine a leg kicking a ball: kick -> キャク, and the leg is the body part that kicks.
counter for chairs or seats
script; screenplay; scenario
losing one's position; losing one's standing; downfall; fall (from power); being overthrown
tripod; three legs
footlight; limelight
dramatization (e.g. of a novel); dramatisation; adaptation (for the stage or screen)
pilgrimage
both legs
stepladder; steps
footnote
three-legged race
being based on
bridge pier; pontoon bridge
leg strength; walking ability; running ability
beriberi; severe thiamine deficiency
express messenger; postman; mailman; courier
leg length (welding); length of fillet weld
daytime
kanji "dancing legs" radical (radical 136)
beauty of slender female legs